Butman, Bradford, Alexander, P.S., and Bothner, M.H., 2004a, Time-series photographs of the sea floor in western Massachusetts Bay - June 1997 to June 1998: U.S. Geological Survey Data Series 87, DVD-ROM. Also online at http://pubs.usgs.gov/ds/2004/87/

Butman, Bradford, Alexander, P.S., and Bothner, M.H., 2004b, Time-series photographs of the sea floor in western Massachusetts Bay - June 1998 to May 1999: U.S. Geological Survey Data Series 96, DVD-ROM. Also online at http://pubs.usgs.gov/ds/2004/96/

Butman, Bradford, Alexander, P.S., and Bothner, M.H., 2004c, Time-series photographs of the sea floor in western Massachusetts Bay - May 1999 to September 1999; May 2000 to September 2000; and October 2001 to February 2002: U.S. Geological Survey Data Series 97, DVD-ROM. Also online at http://pubs.usgs.gov/ds/2004/97/